how to clean the ivory

HOW TO CLEAN THE IVORY
As ivory is used in various things
1. Utensils
2. Decoration pieces
3. Cloth buttons
4. Furniture
5. Toys
6. Shoes
7. Jewelry
8. Stationery
It can be seen almost everywhere in our daily life.
The main thing is that such costly product may got dull and brown after some time so what should we do to make refresh again as it was in its first day?

I have the solution of this problem
Stem 1:
Take a glass jar
Step 2:
Take the ivory product
Step 3:
Place the ivory product in the frame or jar. It should be noted that the jar or frame should be of glass.
Step 4:
Place this whole jar and ivory set in the sunlight.
Step 5:
Left this ivory piece in sunlight till the sun light will end
Step 6:
Remove this ivory product and you will get the best white ivory as it was new.